Texture isn't appearing in final render
Lets get our thought location to be the MushroomCap texture.  Image above. Scroll down on your Blender application to see the next panel. 



Your texture Influence panel settings must have [Color] checked with value 1 as in the image.  This is marked with the yellow arrow.  Geometry [normal] should be unchecked.  Please verify.  The red squiggle X means ... take away the check box in your settings.  Image above. Or you can experiment and see if you like the [normal] influence.  You are an artist.  The [normal] setting does not affect color, it affects whether or not your mushroom has indentations and protrusions, dimples and pimples as a simplified explanation.



Your textures are not present in the file posted, therefore I placed some random texture to your mushroom for testing, with no artistic effort. This new texture can change the settings in the texture panel. When you posted your file it has a common mistake .... the textures from your hard drive are not present.  The textures can be packed into the file.  You can search for a info here at BSE Blender Stack Exhange on that topic.  You may not need the correction to the file if the problem is solved.

Feel free to ask any directly related question in comments.  You can vote this candidate answer up or down corresponding to whether it helps or hurts the situation.